Thiede is described as white with brown hair and blue eyes. He stands 6 feet tall and weighs around 170 pounds.

It is unknown what he was wearing, but he was driving for Uber and Lyft in a four-door 2014 black Nissan Altima with the California license plate #7CSD450, police said.

A generic image of a black 2014 Nissan Altima, which was the type of vehicle driven by missing man Joshua Thiede.

Thiede has not been seen or heard from since, and his family is concerned for his safety, according to authorities.

His mother, Janet Thiede, tweeted out Saturday that according to her family usage cellphone plan, her son or someone using his phone called 911 on Feb. 12 and then hung up.

"This doesn't feel right. Honestly, it didn't really feel real to me until after the news stations started calling," friend Yokeena Jamar said. "The 911 phone call was made on Monday at 2:30 p.m. We're not sure why he made that phone call. There was no transcript of that phone call because they did not record it. It was a hang-up call."

Other friends said Thiede was working on a shoe line that would benefit the homeless and he would never just disappear.Jamar said Thiede would tell at least his sisters or his mother that he would be going somewhere.